Title:
【発明の名称】セルロースカーバメイトの製造方法
Document Type and Number:
Japanese Patent JP2000505135
Kind Code:
A
Abstract:
A method of producing cellulose carbamate is described in which: (a) cellulose is brought into contact with liquid ammonia at an initial pressure exceeding atmospheric pressure and a temperature of at least about 25 DEG C, in the presence of urea, the quantity of liquid ammonia sufficing at least to wet the surface of the cellulose; (b)the volume available to the cellulose-urea-liquid ammonia system is enlarged explosively, lowering the pressure by at least 5 bar, and an activated mixture of cellulose and urea is obtained; (c) the activated mixture of cellulose and urea is taken up in an inert organic carrier for the reaction, and heated to a temperature between about 110 DEG C and 150 DEG C to make cellulose carbamate, and (d) the organic reaction carrier and any urea not reacted are removed from the cellulose carbamate obtained. The method saves energy and supplies a very homogenous cellulose carbamate.
Inventors:
Karstens Teeth
Stein Armin
Stein Armin
Application Number:
JP50557798A
Publication Date:
April 25, 2000
Filing Date:
July 08, 1997
Export Citation:
Assignee:
Rhodia Aceto Akchen Gesell Shaft
International Classes:
C08B1/00; C08B15/06; (IPC1-7): C08B15/06
Attorney, Agent or Firm:
Yoshihisa Nagai